Visual weather-screen



ilf .JGSTEEE nii NGRMANVLLE, GF LQNDON, ENGLAND.

All WTEATHEESCREEN.

Specification of Letters 'atent.

.lipplication filed .Time 28, 1920. Serial No. 392,348.

To (1M whom t may conce/11a:

Be it known that l, SAMUEL AnGUsTINn nn llonrraiivriliai, a subject ot the King oi Great. Britain and lrelaiuh residing at. Londpn. England, have invented certain new :ind useliiil improvements in and Connected with Visual llfTeat-her-Screens. of which the tolhivvingF is a specification.

This invention relates to improvements `in centrifugal visual Weather screens, usually called clear View screens. for 'instance oi the type desciil ed in spccilication to Letters Patent No. 1297805.

rihe object of the invention to renfjier a. Screen or' this type particularly uset'ul inexposed positions., 'for example in a loconiot ve, aeroplane, boat., or other 'last mov ing vehicle, er on a light house or coast signal station, Where a snlllciently strong; current air is available 'to provide die energy nccessary to drive the disk. u

recording to the invention the. disk is providedxniith vaiies on or adjacent to the circumference, adapted to he driven hy the air currents so as to rotate the disk. the air discharged 'troni the vanos heine' lcd or deflected by suitable means z way troni the 'tace ot the observer behind the disk.

The planes o'l the rapes are preferably' perpendicular to the. 'tace oi L i isl, and the varies are so inclined or cui-ved that the air striking the disk and deflected radially on to the vanos escapes substantially tangentiailv7 that is, the vanos are oi the. radial flow type as distinguished troni vanos set o n the periphery of a. disk and driven by air oiving parallel to the axis ot rotation and known as vaiies of the parallel dow type. i front plate er wind shield having' a suitable aperture Jlgor the disk, is prefer-ahlyarranged to guard the iront ot the vaines and te assist in the dcilection ci? the air discha ,d by them outward..

Vlhen such a disk is set in surface, say a 'Window or screen. or ii'rnnediately in front of it to guard it or a portion ci it., the air discharged escapes alone' the tace of. such surface Without the necessity of passing through it. to get awr-v The. 'freinent ol .i the vrind veines a. considerable current ci' air i descril-ed Several forms of the. invention are illustrated by the accompanying drawings.

Figures l and Qare respectively a side sectional elevation and a front elevation of a tace guard adapted to be held in the hand.

3 is a side sectional elevation of a clear vieiv screen fitted in a revolving hood.

fl is a rear elevation of part of a locomotive cab with two look-out screens fitted one inside and the other outside of the cab.

Figs. 5 and 6 are sectional plans on V-V and VL-Vl Fig. 4l on a larger scale.

Fig. 7 is a rear elevation illustrating a screen fitted to a different type of locomotive cab look-outl Window.

ln the simple forni of the invention illustrated by Figs. l and 2 which is suitable for use for example by a look-out man in a erows nest, 'on the top gallery of a light-house or in any siniilar other exposed position a glass disk l is adapted to rotate freely on a ball eminentes may si, resi.;

bearing' 2 or other bearing carried by a bar 3 fitted with a handle Ll. A thin brass rim 5 is spun over the edge oiE the disk l and a number or" vanes 6 are brazed to the riin. The varies 6 extend over the face of the disk. iii/'hen the guard is held in the Wind the disk l is rapidly rotated and as the planes of the vanos are. parallel. to the line oi' sight they interfere hardly at all with the transparency of the disk Where they cross it. Llishield or hood 7 carried by the baip shields the observers face or binoculars from rain. I

When the disk rotates, the air is discharged sidewise by the vanes and not onto the ohservers face as would be the case if radially projecting` vanes, namely vanesfoi3 the parallel flow type, were I'itted on the periphery of the disk.

Fig. 3 illustrates the provision of a front plate or wind shield 8 to guard the front oi the vanos 6, and to assist in the delicotion of the air discharged by them outvvardly. in the particular form shown the disk l Ymounted in a revoluble hood 9 of the type described in the specification of the ie'liore mentioned patent. rlhe front plate 8 has a suitable aperture 10 '1n front et the clear part. of the disk and is in spaced re ation to the iront 19 of the hood so as to ,torni thcieiiith conduit 2i). The iront lill@ to leave adequate clearanceV or an outlet 21 for the discharge of the air which enters the aperture 10, and which is deflected by the disk-1 onto the vanes 6.

The provision of a front plate as above describedavoids any difficulty which might otherwise arise due tothe formation of a cone of compressed and somewhat inert air in front of the hood, which might extend beyond the disk, the area of which is much less than that" of the face of the hood. At

and behind the forward edge of the hood,

on the other hand, there is ifanything a reduction' of pressure due to the velocity and deflection of air currents escaping past this edge, so that byconnectingthis low pressure zone to the high pressure zone of compressed air in front of the disk by conduit such as in which the vanes 6 4 and 5, the usual window is removed and replaced by a disk 1 fitted with vanes 6 as aforesaid. The wind guard or front plate for the vanes may be in the form of a casing 11 secured to the front of the usual hood or cab 12 and passing to the roof 13 where it has a rearward extension 14 having a discharge aperture 21 all as shown to the right of Fig. 4 and in Fig. 5; or the front of the hood or cabmay be used as the wind guard in which instance, the casing 11 may be litted inside the hood or cab 12 and extend to and pass through one side thereof all as shown in the left hand of Fig. 4 and in Fig. 6. In the former instance the disk 1 rotates on a spindle 15 supported by a bracket 16 cast in one with a ring 17 screwed' to the hood or cab 12, whereas in the latter instance the ring 17 is bolted to the casing 11.

The casing l1 Figs. 4 and 5 may be provided with a hole 22 in the lowermost part to drain off any water which may accumulate therein.

Fig. 7 illustrates a form of the invention suitable for a particular'type of look-out adopted on certain types of locomotive, the existing window 18 having a' circular aperture formed in it corresponding to the ring 17 which is screwed to the window frame 23 or otherwise suitably supported. A front plate or casing 11 similar in construction to that shown in Fig. 5 is fitted in front of the cab, but extends to and discharges at one side of the hood or cab 12.

vIn the three forms last described the casings 11 discharge near the roof or sides of the hoods or cabs' into zones of relatively llow pressure when the cab is exposed to a high `wind or traveling at high'speed. The invention is capable of many applications in positions where there is an adequate air current to operate the vanes.

comprising a rotary transparent disk, radial flow vanes on said disk adjacent to the.cir cumference thereof adapted to be driven by the" air impinging on the face of said disk and deflected byy said vanes tangentially outward, and a plate located in front of and spaced from said disk and formed with a central air inlet opening, there being an air exit opening formed between the plate and the disk and extending beyond thecircumference of the latter.

4. A centrifugal visual weather screen comprising a rotary transparent disk, radial flow vanes on said disk adjacent to the cir'- cumference thereof adapted to be driven by the air impinging on the face of said disk, and defiected by said vanes outward, and a shield beyond the circumference of said disk, I

substantially as and for the before set forth.

5. A centrifugal visual weather screen purpose hereiny comprisinga rotary transparent disk, radial flow vanes on said disk adjacent to the circumference thereof adapted to be driven by the air impinging on thev face of said disk and vdeflected by said vanes outward, and a shield -beyond the circumference of said disk in the form of a hood having an'aperture in the front thereof for the/reception of said disk, and means for conducting away the air discharged by said vanes to a position outside said hood, substantially as and for the purpose hereinbefore set forth.

6. A centrifugal visual weather screen comprising a rotary transparent disk, radial flow vanes on said disk adjacent to the circumference thereof adapted to b'e driven by the air iinpinging on the face ,of said disk -and deflected by said vanes' tangentially outward, and a shield beyond the circumference of said disk in the form of a hood having an aperture in the front thereof for the recepin Space 5 the space b said ha@ comprising :L ro

l0 flow 'mms am s 

